telegraf: Remove docker total option

Option "total" of plugin "inputs.docker" deprecated since version 1.18.0
But for now, it still needs to be set for "total_include" to be honored.

templates/telegraf-docker.conf

@@ -2,6 +2,7 @@
   endpoint = "unix:///var/run/docker.sock"
   perdevice = false
   total = true
+  total_include = ["cpu", "blkio", "network"]
   container_name_include = []
   container_name_exclude = []
   # container_state_include = []